Supported by the 863 Program of the Ministry of Science and Technology and the National Natural Science Foundation of China, the team led by Prof. Xue Qunji and Wang Liping, State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, collaborated with the National Center for Advanced Tribology, University of Southampton, UK. Progress has been made in the research of adaptive diamond-like carbon-based nanocomposite films. Diamond-like carbon films with excellent toughness and low friction properties and low environmental sensitivity have always been the breakthrough of research in the field of hard solid lubricant films. The research group used the multi-target magnetron sputtering thin film deposition technology to systematically prepare the periodic table of elements for the first time based on the theory of first-principles calculation and finite element simulation based on the multi-co-doping technology of weak carbon and strong carbon metal elements. A carbon-based multicomponent composite film system in which nine kinds of strong carbon and weak carbon metal are co-doped (nc-TiC/aC(Al), nc-WC/aC(Al), nc-CrC/aC(Al), nc- ZrC/aC(Al), nc-NbC/aC(Al), nc-MoC/aC(Al), nc-HfC/aC(Al), nc-VC/aC(Al) and nc-TaC/aC(Al )). These films have a typical nanocrystalline/amorphous composite structure and excellent toughening characteristics, and exhibit a certain tribological low environmental sensitivity. Combined with the wear surface micro-area Raman spectroscopy and FIB-HRTEM analysis and thermodynamic calculations, the researchers found that the thickness of the low-shear carbon-rich layer on the surface of the film due to friction is about 30 nm, and proposed the thermodynamic drive of the friction process. Two-phase separation induces a mechanism of low friction and adaptive characteristics. The relevant results are published in the recently published Journal of Materials Chemistry (2012, 22, 15782).
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